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Personne :
Dionne, Mélanie

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Dionne

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Mélanie

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Université Laval

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  • PublicationRestreint
    How does salinity influence habitat selection and growth in juvenile American eels Anguilla rostrata?
    (Wiley, 2015-01-21) Pavey, Scott; Dionne, Mélanie; Bernatchez, Louis; Audet, Céline; Castonguay, Martin; Boivin, Brian
    The influence of salinity on habitat selection and growth in juvenile American eels captured in four rivers across eastern Canada was assessed in controlled experiments in 2011 and 2012. Glass eels were first categorized according to their salinity preferences towards fresh (), salt () or brackish water () and the growth rate of each group of elvers was subsequently monitored in controlled and environments for 7 months. Most glass eels (78–89%) did not make a choice, . they remained in . Salinity preferences were not influenced by body condition, although a possible role of pigmentation could not be ruled out. Glass eels that did make a choice displayed a similar preference for (60–75%) regardless of their geographic origin but glass eels from the St Lawrence Estuary displayed a significantly higher locomotor activity than those from other regions. Neither the salinity preferences showed by glass eels in the first experiment nor the rearing salinities appeared to have much influence on growth during the experiments. Elvers from Nova Scotia, however, reached a significantly higher mass than those from the St Lawrence Estuary thus supporting the hypothesis of genetically (or epigenetically) based differences for growth between from different origins. These results provide important ecological knowledge for the sustained exploitation and conservation of this threatened species.
  • PublicationRestreint
    RAD Sequencing Highlights Polygenic Discrimination of Habitat Ecotypes in the Panmictic American Eel
    (Elsevier, 2015-06-15) Pavey, Scott; Dionne, Mélanie; Bernatchez, Louis; Audet, Céline; Gaudin, Jérémy; Castonguay, Martin; Normandeau, Éric
    The two primary ways that species respond to heterogeneous environments is through local adaptation and phenotypic plasticity. The American eel (Anguilla rostrata) presents a paradox; despite inhabiting drastically different environments [1], the species is panmictic [2, 3]. Spawning takes place only in the southern Sargasso Sea in the Atlantic Ocean [1]. Then, the planktonic larvae (leptocephali) disperse to rearing locations from Cuba to Greenland, and juveniles colonize either freshwater or brackish/saltwater habitats, where they spend 3-25 years before returning to the Sargasso Sea to spawn as a panmictic species. Depending on rearing habitat, individuals exhibit drastically different ecotypes [4-6]. In particular, individuals rearing in freshwater tend to grow slowly and mature older and are more likely to be female in comparison to individuals that rear in brackish/saltwater [4, 6]. The hypothesis that phenotypic plasticity alone can account for all of the differences was not supported by three independent controlled experiments [7-10]. Here, we present a genome-wide association study that demonstrates a polygenic basis that discriminates these habitat-specific ecotypes belonging to the same panmictic population. We found that 331 co-varying loci out of 42,424 initially considered were associated with the divergent ecotypes, allowing a reclassification of 89.6%. These 331 SNPs are associated with 101 genes that represent vascular and morphological development, calcium ion regulation, growth and transcription factors, and olfactory receptors. Our results are consistent with divergent natural selection of phenotypes and/or genotype-dependent habitat choice by individuals that results in these genetic differences between habitats, occurring every generation anew in this panmictic species.